<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>计算器</title>
	
</head>
<body>
	<input type="text" name="">
	<select id="fuhao">
		<option value="0">+</option>
		<option value="1">-</option>
		<option value="2">*</option>
		<option value="3">/</option>		
	</select>
	<input type="text" name="">
	<input type="button" name="" value="计算">

</body>
</html>